K/D also doesn't factor in the non-trackable things in the team game modes like intentional suicide missions, like standing your ground at an almost-captured B even if a super may be coming or going 3 on 1 so your team can flank. I used to play kill confirmed in mw3 and my k/d was between 1.2 and 1.6 or so while my friend got as high as a 3 but we won many games not solely because of his kills but me running out in the open to get the objective. Obviously, k/d is more telling in rumble but team modes are reliant on intangibles too